Dränung - Nährstoffausträge, Flächenausweisung und Management. - Michael Trepel (Wasserwirtsch., 2007)

Database of Measures Supporting Creation of Management Plan and Programme of Measures for Implementing - Water Framework Directive. - Friedhelm Hosenfeld; Dirk Behrens; Marcus Lempert; Andreas Rinker; Michael Trepel; Angelika Steingräber (EnviroInfo, 2008)

Assessment Database Supporting Implementation of Water Framework Directive in Schleswig-Holstein. - Friedhelm Hosenfeld; Johanna Lietz; Michael Trepel (EnviroInfo, 2011)

Waterbody and Nutrient Information System Schleswig-Holstein. - Friedhelm Hosenfeld; Michael Trepel; Johannes Tiffert (EnviroInfo (2), 2016)

Wasserkörper- und Nährstoffinformationssystem Schleswig-Holstein. - Friedhelm Hosenfeld; Johannes Tiffert; Michael Trepel (UIS, 2016)